Steam boiler furnace



9, 1947. .1. R. EVANS STEAM BOILER FURNACE Fired July 21, 1944 3 Sheets-Sheet 1 Aug. 19, 1947. J. R. EVANS STEAM BOILER FURNACE 3 Sheets-Sheet 2 Filed July 21} 1944 Q IVENTOR.

INVENTOR.

Aug. 19, 1947. J. R. EVANS STEAM BOILER FURNACE Filed July- 21, 1944 3 Sheets-Sheet 5 Patented Aug. 19, 1947 STEAM BOILER FURNACE John R. Evans, Windsor, Ontario, Canada Application July 21, 1944, Serial No. 545,994

3 Claims.

My invention relates to an improvement in steam boiler furnaces, for heating and other purposes, shown in the accompanying drawings and more particularly described in the following specification and claims.

In the drawings Figure l is a perspective View of the furnace, with parts broken away and in section, showing a water jacket surroundin the combustion chamber, with grate-bars level with the lower wall of the water jacket, also a Plurality of spaced water tubes extending across the top of the combustion chamber and openin into the front and back walls of the water jacket; the view also shows a plural number of superposed sections-in spaced relation to each other, located above th combustion chamber, each section comprising a plurality of tubes,- connected with the chambered ends of the section, but staggered in relation to the tubes of the adjacent section, above and below, for the circulation of water and vapor.

Figure 2 is a side elevation of the tapering pushnipples for connecting the respective sections together, and also for connecting the lower section with the water-jacket surrounding the combustion chamber.

Figure 3 is a vertical cross-sectional view through the furnace, showing portions of the endwalls of the respective sections broken away to disclose the connecting tubes in staggered relation to the tubes in the sections above and below.

Figure 4 is a vertical cross-sectional view of the furnace, taken at right-angles to that shown in the preceding view, to disclose the opening for delivering fuel into the combustion chamber, closed by a fir door, not shown; also a shaker mechanism for removing theclinkers; a water pipe to deliver water into the water jacket, under control of suitable check-valves, from a return feed-water reserve tank, and the water supply main.

Figure 5 is a horizontal cross-sectional view through the furnace, and the water tubes extending across the top of the combustion chamber, showing the water in the water jacket surrounding the combustion chamber in fre circulation with the water in said tubes.

Figure 6 is a horizontal cross-sectional view through the furnace-wall, showing a plan view of one of the sections in place within the furnace and its plurality of tubes connected with the chambered ends of the section; also a vertical port-opening, as in each chambered end section, through which the water and vapor circulate to adjacent sections through like ports.

2 Figure 7 is a horizontal cross-sectional view through one of the sections-detached fromv the furnace-in which arrows indicate the flow of water and steam through the spaced tubes, connecting the chambered-ends of the section, also the removable nut-plugs opposite the end of each tube, whereby on the removal of the plugs, the cOre used in cast-the chambered tubes may readily be removed.

Figure 8 is an end-view of the lower halfof the section shown in Figure 7, the tubes being indicated by dotted lines, showing the removable. nut-plugs, and the lugs, to maintain the sections.

in spaced relation within the furnace wall.

Figure 9 is a horizontal sectional view through a section adapted to be mounted above or-below the section shown in Figure 7, and to coordinate. therewith, whereby the tubes of the respective adapted to abut like lugs on adjacent sectionsto maintain the sections in spaced relation to-each other within the walls of the furnace.

Referring now to the reference numerals on the I denotes a water-jacket forming a drawings: combustion chamber 2, mounted onthe walls v0f the ash-pit 3, the walls of which support a.p1u-

rality of rocking grate-bars 4, adapted tobe manually operated by a lever 5. The combustion chamberZ hasan opening 6, in

the front wall of the water jacket I, whereby coal or other fuel may be delivered intov the combus tion chamber, closed by a door 11 The numeral 8 indicates the usual ash-pit doo and 9, a clean-out door.

Extending across the combustion chamber, and opening into the top of the water-jacket area plurality of spaced tubes IO, and superposed above said tubes and supported in spaced relation thereto are sections II, 12, and I3, see Figures 3.and 4, the respective tubes of said sections being stagered in relation to those above and below when superposed within the walls of the furnace, as indicated in the drawings.

Projecting from each section are lugs I4, to maintain said sections when superposed, in spaced relation within the walls I5 of the furnace. A tapering push-nipple I6, see Figure 2, connects the water jacket I with the section II, directly above, and similar tapering push-nipples respectively connect section II, with sections I2 and I3, for the circulation of steam. Tie-rods ll, rising There is also provided a pipe 28 connecting the. 1

lower tubes with the water supply pipe line and engaged with the lower tubes at the 1eve-l'ofthe upper end of the nipple. Thus-water formed by 1 condensing steam may collect in the lower portions of the lower super heater tubeswhereit will be subjectedto heat of products of combustion passing upwardly aboutthe tubes and this hot water will be reconvertediinto steam. If too much water accumulates in 'theilower'tubes, same-will run oflithrough the pipe 28*and. into the'watei supply pipeline.

Suitable water gauges" 24' are provided for the reserve-tank 2|"; the water'jacket' I, and the sec= tion"! I; see'Figure 3.

Rising from the top of the furnaceisa smokepipe 25.

Water will start boiling in the'water jacket" I, and thence the boiling point in section :I I j cire culation' of thesteam is then started throughout its entire course of 1 travel in the-boiler, absorbing all the he'at'transmitted by thehotgases-so that, when the" steam reaches the plurality of" tubes. in the l2iand I3, it is superheated; The superheated steam leaves' the boiler through pipe? I 9, to fulfil its -function of heating; cooking etc," and 'the" condensation therefrom returnsitoi'the reservetank 21; and thence to the-water jacket l 'asprei-' viously explained.

The tubes Ill are relatively narrow and convexshaped'at'the top and bottomfto effect 'thereadyi releaseuor discharge of'anyisootor carbon :that" mightoth'erwise cling; to the outside ofthe tubes and thereby retard" the rapid heating of: the watercirculating therethrough;

Nut plugs' 26"arei' screwed 'into the respective sections. I I, I2, f'an'd' I 3; opposite the ends Of the tubes 10, following the withdrawalof; the cores: usedin casting the chambered sections:

Numeral 21', denotes a connecting tie between the otherwise free ends of sections:.II, IZ,,I3; and the adjacent tubes. I0," toretainthe tubes in fixed parallel'relation'."

What I claimis;

1. A steam boiler comprising. a :casing having a lowerporti'on ofdouble wall construction" forming a water. jacket and constituting walls of; a fire box; the portion of. the casing. above the waterjacketconstituting a heating chambericoma municating with the fire-box, rods extending upwardly .-fromi the water jacket at opposite sides of theheating chambentubes in the upperportion of said fire-box having ends communicating with front and rear portions of the water jacket, super heaters in said casing supported from said rods one above another and each having transversely spaced inter-communicating tubes, nipples connecting the super heaters with each other and the lower super heaters with the top of the water jacket, a service pipe leading from the upper'super heater, a tank for-receiving condensate,'a pipe line for supplying water to the lower portion of the water jacket, a pipe leading from the bottom of said tank to said pipeline and a pipe leading from the lower super heater in spaced relation to the bottom thereof to the pipeline,..a check. valve in the pipeline between said pipes opening towards the water jacket.

2.-A steam:;boiler comprising a casing having a lowenportion of double wall construction forming a water jacket constituting walls of a firebox and an upper portion constituting walls of a heating'chamber, tubes extending horizontally in the-upper portionof the fire-boxhaving their ends communicating-with the water jacket' and filledwith water to the level of water in the water jacket, super heaters in the heating chamber'one above another and each having intercommunicating tubes, nipples connecting the super. heaters with each other and the lower super heater with thetop of the water jacket, the nipple of the lower super heater-projecting upwardly therein whereby condensate may accumulate in: the lowersuper heater, a pipeline for delivering: water'to the water jacket and a pipe for-delivering condensate from the lower super heater-to said pipeline.

3. A steam boiler comprising a casing having a lower portion constituting water jacketed walls of a fire-box and an upperportion constituting walls-of a heating chamber, transversely spacedtubes in the upper portionof the fire-box having ends communicating with the water jacket, and filled with-water from thewater jacket, super heaters in the'heating chamber spacedoneabove another and communicating with each other, a nipple connecting the top of the water jacket with the lower super heater and projectingupwardly through the bottom thereof, a waterline for delivering water to said water-jacket; and a pipe-leading from the lower super heater to said pipeline and communicating with thesaid superheater atthe level of" the upper end of said nipple.

JOHN'R. EVANS;-

REFERENCES CITED 1 The following. references are of record in the file of. this patent:

UNITED STATESPATENTS" Number Name Date 1,576,646 Farmer Mar. 16, 1926 158,755 Taylor Jan. 12, 1875 930,140 Bosley Aug. 3, 1909, 

